That stinks. you should definetely let CO know how you feel regarding the HUB penalty for those who remain loyal to their "hometown" airline.
I guess the vouchers are different than those that came with the, now nonexistent, privledge packs.
ive never had a problem using the $100 off coupon for tickets over $499 and ive always used the $99 companion certificate during the holidays.
anyway, definetely let CO know how you feel you are being treated.